There has been some confusion about the recent changes to Vengeance that we’d like to clear up. Two things have changed with Vengeance lately:

Oct 8 - Vengeance should now ramp up more quickly. Avoidance will now grant Vengeance based on the average damage of the avoided NPC auto-attack, instead of just refreshing existing Vengeance. This does not apply to enemy special attacks.There should be an addition to this: Vengeance was also reduced by 10% at the time that hotfix was noted. We apologize for that being missed in the patch notes. Vengeance now accrues at a rate of 1.8% of damage taken, down from 2.0%.

Oct 16 - Fixed an issue with the way that Vengeance is calculated that could cause very large but infrequent spikes of damage to grant much more than the intended amount of Vengeance.Based on the hits a tank takes, Vengeance attempts to predict what 50% of average Vengeance for that level of incoming damage will be, and bumps the tank straight to that level. However, it previously based that calculation on a 1.5 second attack speed. It now bases the calculation on the enemy’s auto attack speed for auto attacks, and a 60 second interval for special attacks.

Tanks will still get the expected amount of Vengeance from the damage taken. This change just means that the first hit from a slow-attacking boss will bump Vengeance straight up to the expected amount.